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Re: 84 900 F Prepared Notchback
Posted: Fri Mar 08, 2013 1:52 pm
by Luke
SwedeSport wrote:I recall watching some old video of the factory rally team running incredibly wide wheels on a car. I believe they were running a closed course tarmac event.
The dimensions from the hub surface towards inboard is identical to the stock wheels and tires. all the width is added to the outside of the rim.
Wasn't someone on here running 10 inch stock car wheels with fat slicks on it without much problem?
Ideally, you want to grow tires equally on both sides of the virtual centerline projected through the upper and lower ball joints down to the contact patch. Otherwise the scrub radius becomes too much and when you are turning you are "pushing" a lot more tread than you are "pulling" and the steering dynamics tend to get weird and unbalanced.
Of course lots of people run these superwide tires with on all sorts of things and seem to make it work at auto-x's and such, but I've driven a few cars like this and although the absolute "grip" may be more, they don't tend to be very fun to drive. Just my 2 cents....
Re: 84 900 F Prepared Notchback
Posted: Fri Mar 08, 2013 1:56 pm
by Luke
Luke wrote:SwedeSport wrote:I recall watching some old video of the factory rally team running incredibly wide wheels on a car. I believe they were running a closed course tarmac event.
The dimensions from the hub surface towards inboard is identical to the stock wheels and tires. all the width is added to the outside of the rim.
Wasn't someone on here running 10 inch stock car wheels with fat slicks on it without much problem?
Ideally, you want to grow tires equally on both sides of the virtual centerline projected through the upper and lower ball joints down to the contact patch. Otherwise the scrub radius becomes too much and when you are turning you are "pushing" a lot more tread than you are "pulling" and the steering dynamics tend to get weird and unbalanced.
Of course lots of people run these superwide tires with on all sorts of things and seem to make it work at auto-x's and such, but I've driven a few cars like this and although the absolute "grip" may be more, they don't tend to be very fun to drive. At least this car has power steering which should help...
Just my 2 cents....
Re: 84 900 F Prepared Notchback
Posted: Tue Mar 12, 2013 2:41 pm
by 87 n/a
SwedeSport wrote:Wasn't someone on here running 10 inch stock car wheels with fat slicks on it without much problem?
I was running them, so was SPGeeBee. No power steering in the car. Ran them at a couple AutoX, Daytona and Sebring. Helped me build my Popeye forearms.
Took a driving instructor out with me at Sebring once and he couldn't believe how well the car handled and stuck.
Unfortunately, the SCCA won't let me run them anymore since they aren't DOT approved. That forced the 88+ conversion to utilize spare wheels/tires in my garage.
In the field at Sebring...
Original test fit...
Re: 84 900 F Prepared Notchback
Posted: Tue Mar 12, 2013 3:13 pm
by SwedeSport
I plan to run a fair amount of camber in the fronts. Which should help the situation a little by loading the inside half of the tire. The rears dont care how wide you go, but I can understand about the effects on the steering axle.
Did you have any problems with the tires rubbing the fenders?
Re: 84 900 F Prepared Notchback
Posted: Tue Mar 12, 2013 3:22 pm
by 87 n/a
I didn't ever rub, but those are 13" rims. Great acceleration from a N/A, probably topped out in the high 90's though
Re: 84 900 F Prepared Notchback
Posted: Wed Mar 13, 2013 6:47 am
by Crazyswede
I'd think they would be a nightmare on any non even surface.
Re: 84 900 F Prepared Notchback
Posted: Wed Mar 13, 2013 12:37 pm
by DrewP
Sebring is awfully rough.... Just saying.
Re: 84 900 F Prepared Notchback
Posted: Wed Mar 13, 2013 1:02 pm
by SwedeSport
The worst thing that can happen is that I have to try a different wheel and tire combo.
Re: 84 900 F Prepared Notchback
Posted: Wed Mar 13, 2013 2:01 pm
by Crazyswede
SwedeSport wrote:The worst thing that can happen is that I have to try a different wheel and tire combo.
well the worst thing is that you bump steer off the road
Re: 84 900 F Prepared Notchback
Posted: Thu Mar 14, 2013 1:17 pm
by Adrian Thompson
[quote="87 n/aUnfortunately, the SCCA won't let me run them anymore since they aren't DOT approved. That forced the 88+ conversion to utilize spare wheels/tires in my garage.
[/quote]
What class are/were you running that you can't run slicks anymore?
Re: 84 900 F Prepared Notchback
Posted: Thu Mar 14, 2013 2:51 pm
by 87 n/a
Adrian Thompson wrote:What class are/were you running that you can't run slicks anymore?
Slicks are ok as long as they are labelled D.O.T. on them. Mine were not.
Re: 84 900 F Prepared Notchback
Posted: Thu Mar 14, 2013 3:55 pm
by MattWatson
87 n/a wrote:Adrian Thompson wrote:What class are/were you running that you can't run slicks anymore?
Slicks are ok as long as they are labelled D.O.T. on them. Mine were not.
By DOT regs, isn't that impossible though? Barring things like the MT cheater slicks and stuff like that which have 2 sips.
Re: 84 900 F Prepared Notchback
Posted: Thu Mar 14, 2013 4:03 pm
by SwedeSport
Hoosier A6s have two grooves in them, which is enough to make the difference between D.O.T. legal and not.
It is "minimum" compliance at it's best.
Re: 84 900 F Prepared Notchback
Posted: Thu Mar 14, 2013 4:12 pm
by 87 n/a
Stuff like Hoosier R6 and Kumho Ecsta V710 both have 2 grooves and are D.O.T. certified, but are essentially slicks
Re: 84 900 F Prepared Notchback
Posted: Thu Mar 14, 2013 4:18 pm
by Adrian Thompson
But there are many SCCA classes that allow real slicks, not DOT slicks. I'm puzzled why you can't run, just move up to a class that allows real slicks like Prepared or Mod